106 SMERINTHUS TILL®. 



the figure is slender. The first moult takes place 

 when the larva is about 11 mm. long ; the horn becomes 

 3 mm. long, yellowish in colour with dark short spines ; 

 the lobes of the head become pointed, with yellow tips, 

 the eight subdivisions of each segment set with rough 

 points ; the colour yellowish-green, and the seven 

 yellow lateral slanting stripes appear plainly. The 

 second moult comes when the larva is about 18 mm. 

 long; the tips of the lobes of the head become reddish, 

 the rough points on the skin yellowish. The third 

 moult finds the larva about 25 mm. long, and the 

 yellow scutcheon on the thirteenth segment appears. 

 The fourth moult is passed when the larva is about 

 35 mm. long ; up to this time the figure has been very 

 much more slender than that of ocellatus or populi, but 

 now it begins to grow stouter. The biggest larva I had 

 this summer grew to be something less than 50 mm. 

 in length, stout, but tapering forwards a good deal, 

 the skin smooth, the dots remain but are not rough ; 

 the face triangular, the horn short and rough, a rough 

 oblong patch on the anal flap ; the back light yellow- 

 green, the belly duller green, the dots above the 

 spiracles yellow, below them whitish ; the face glaucous 

 green slightly dotted with white, the lobes broadly 

 bordered with opaque white outside, tips of the lobes 

 slightly reddish ; the seven slanting lateral stripes are 

 pale yellow, edged in front with bright green, six of 

 them begin just at the level of the spiracles, but the 

 seventh is longer and goes through segments 11 and 

 12 running up to the horn. As the larva matures 

 there comes a red tinge in these stripes ; the horn is 

 blue above and red with yellow dots below; the rough 

 spot on the anal flap is red edged with deep yellow ; 

 the spiracles are yellowish-white broadly ringed with 

 red ; the thoracic legs pale yellowish ringed with deli- 

 cate pink, the ventral and anal prolegs coloured like the 

 belly. 



The larva generally goes underground for pupation, 

 but I have found the pupa hidden in rough chinks of 



